A hydrogen balloon containing 0.250 moles of hydrogen gas explodes in the presence of oxygen such that all the hydrogen reacts. How much heat is released? H2(G) + (1/2)O2(G) —> H2O; H= 286 kJ/mol

Also try explaining the steps so I can learn at least a little but if you don’t want too it’s alright

Esign techniques and materials that reduce the negative environmental impact of a structure are referred to as

What is the result of multiplying (2.5 × 1010) × (2.0 × 10-7)? a. 5.0 × 103 b. 5.0 × 10-3 c. 5.0 × 1017 d. 5.0 × 10-17

Which statement is usually true about the relationship between activation energy and reaction rates? low activation energy barriers result in low rates. high activation energy barriers result in low rates. low activation energy barriers result in no reaction. high activation energy barriers result in no reaction.